巷道多向吸能防冲支护结构性能研究
Study on anti-impact support structure performance of multi-direction energy absorption for roadway
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摘要: 针对现有门式支架抗冲击能力不足的问题，在梁结构上加入“V”型槽，并在两侧加入柔性链支护结构，构建了一种多向吸能防冲支护结构；以总吸能量、塑性应变、竖向位移等参数作为分析指标，研究支架面对竖向冲击与横向冲击时的支护性能，得到支架各结构的形变程度与整体最易破坏位置。新型支架在竖向冲击工况下，等效塑性应变位置出现在顶梁中部连接处，后续应对顶梁连接处进行加厚处理；在整个竖向冲击过程中3根液压柱竖向位移不平均，表明支架在面对集中冲击的支护效果不是十分理想；在竖向冲击工况下，“V”型槽在面对较大速度冲击时形变较小，面对较小速度冲击时发生较大形变，表明“V”型槽在面对冲击时存在一定的响应速度；在横向冲击工况下，冲击速度较低时支架等效塑性应变主要集中在柔性链与支架连接处，后续应在柔性链与支架连接处设置环形底座；柔性链支护结构在面对横向冲击时承载力与总吸能虽略弱于面对竖向冲击时支架的支护能力，但能够起到很好的水平支护作用。Abstract: Aiming at the problem of insufficient impact resistance of the existing portal support, a kind of anti-impact support structure for multi-direction energy absorption was constructed by adding V-shaped groove to the beam structure and flexible chain support structures on both sides. Parameters such as total energy absorption, plastic strain and vertical displacement were used as analysis indexes to study the supporting performance of the support in the face of vertical impact and lateral impact, and the deformation degree for each structure of the support and the overall most vulnerable position were obtained. Under the vertical impact condition, the equivalent plastic strain position of the new support appeared at the middle joint of the top beam, and then the joint of the top beam should be thickened. In the whole process of vertical impact, the vertical displacement of the three hydraulic columns was not average, which indicated that the support was not very ideal in the face of concentrated impact. Under vertical impact conditions, the V-shaped groove had a small deformation in the face of the impact with large velocity, and a large deformation in the face of the impact with small velocity, which showed that the V-shaped groove had a certain response speed in the face of impact. Under lateral impact conditions, the equivalent plastic strain of the support was mainly concentrated at the connection between the flexible chain and the support when the impact velocity is low, and the annular base should be installed at the connection between the flexible chain and the support. The bearing capacity and total energy absorption of flexible chain support structure under lateral impact were slightly weaker than that of support under vertical impact, but they can play a good role in horizontal support.
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